Abstract: The semiconductive roller according to the present invention includes a nonporous roller body made of a rubber composition containing styrene-butadiene rubber and epichlorohydrin rubber as rubber components.

Abstract: The transfer member according to the present invention is a transfer member employed for transferring toner in an image forming apparatus utilizing electrophotography, made of a rubber composition at least containing styrene-butadiene rubber, ethylene-propylene-diene rubber and epichlorohydrin rubber as rubber components.

Abstract: The semiconductive roller according to the present invention includes a roller body having an outer peripheral surface made of a crosslinked substance of a semiconductive rubber composition and exhibiting Shore A hardness of not more than 60, the semiconductive rubber composition contains a base polymer made of a mixture of (1) mixed rubber N of liquid nitrile rubber and solid nitrile rubber, (2) chloroprene rubber C, and (3) epichlorohydrin rubber E in a mass ratio (C+E)/N of 10/90 to 80/20, the ratios of the chloroprene rubber and the epichlorohydrin rubber in the total quantity of the base polymer are not less than 5 mass % and not less than 5 mass % respectively, and roller resistance at an applied voltage of 5 V is not less than 104? and not more than 109?.

Abstract: Provided is a member for an image forming device. The member has a base material and a film on the surface of the base material. The film is formed to maintain the surface shape of the base material. The member is provided with the base material composed of rubber of a resin, and the metal film composed of a metal, metal oxide, metal carbide, metal nitride or metal sulfide. The metal film is a conductive film formed by ion-plating titanium, aluminum or the like.

Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.

Abstract: A semiconductive rubber roller comprising a toner-transporting portion whose outermost layer is formed essentially of vulcanized rubber containing 0.1 to 30 parts by mass of a phthalocyanine compound for 100 parts by mass of the vulcanized rubber. An electric resistance value of the semiconductive rubber roller which is measured at a temperature of 23° C. and a humidity of 55% is in a range of 103 to 109?, when a voltage of 100V is applied thereto.

Abstract: An image forming apparatus 1 of the present invention has a precession preventing member 8. The member 8 presses a photosensitive drum 2 in an opposite direction against a press-contact force of a developing roller 6. The member 8 is arranged in an area on the outer circumferential surface 10 of the photosensitive drum 2 opposite, with a center axis 3 sandwiched, to a position where the developing roller 6 is press-contacted.

Abstract: The semiconductive rubber composition according to the present invention contains: a rubber content containing at least copolymer rubber containing ethylene oxide as a copolymeric component and chloroprene rubber; and not less than 0.5 parts by mass and not more than 1.5 parts by mass of a thiourea-based vulcanization accelerator, not less than 0.5 parts by mass and not more than 1.5 parts by mass of a guanidine-based vulcanization accelerator and not less than 0.5 parts by mass and not more than 2.0 parts by mass of a peroxide-based crosslinking agent with respect to 100 parts by mass of the sum of the rubber content.

Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.

Abstract: The present invention provides a conductive roller having a toner transport part composed of a vulcanized rubber composition at least on an outermost layer thereof. The vulcanized rubber composition contains a rubber component (A), highly conductive carbon black (B) having a particle diameter not less than 18 nm and less than 80 nm, an inorganic filler (C) consisting of not less than one kind of a metal oxide selected from among a group of titanium oxide, alumina, and silica. A total of a content of the highly conductive carbon black (B) and a content of the inorganic filler (C) for 100 parts by mass of the rubber component (A) is not less than 10 parts by mass nor more than 60 parts by mass.

Abstract: A semiconductive rubber composition contains copolymerized rubber containing ethylene oxide; chloroprene rubber; and acrylonitrile-butadiene rubber. A conductive rubber roller has a conductive rubber layer composed of the semiconductive rubber composition on an outermost layer thereof.

Abstract: A developing roller composed of a rubber member including not less than two vulcanized rubber layers including a surface layer and a base layer. A hardness of the surface layer is set higher than that of the base layer. The hardness of the base layer is set to not more than 60 degrees in a JIS A hardness. A hardness of a laminate of all layers including the base layer and the surface layer is set to not more than 70 degrees in the JIS A hardness. An electric resistance value of the laminate is set to not more than 1010?, when the electric resistance value is measured by applying a voltage of 100V to the laminate at a temperature of 10° C. and a relative humidity of 20%.

Abstract: A conductive roller comprising a toner-transporting portion, made of a vulcanized rubber composition, which is disposed at least on an outermost layer thereof. The vulcanized rubber composition contains a rubber component (A) mixed with a weakly conductive carbon black (B) having a large particle diameter not less than 80 nm nor more than 500 nm, a highly conductive carbon black (C) having a small particle diameter not less than 18 nm nor more than 80 nm, and an inorganic filler (D) consisting of not less than one kind of a metal oxide selected from among a group of titanium oxide, alumina, and silica. The total of a mixing amount of the weakly conductive carbon black (B), that of the highly conductive carbon black (C), and that of the inorganic filler (D) for 100 parts by mass of the rubber component (A) is not less than 15 parts by mass nor more than 60 parts by mass.

Abstract: A developing roller including a semiconductive rubber member having not less than two vulcanized layers including a base layer composed of a vulcanized electro-conductive rubber composition and a surface layer composed of a vulcanized rubber composition. An electric resistance value of the base layer is set to not more than 107?, when the electric resistance value of the base layer is measured by applying a voltage of 100V thereto at a temperature of 10° C. and a relative humidity of 20%. An electric resistance value of a laminate of all layers including the base layer and the surface layer is set not more than 107? in the same condition as the above-described condition in which the electric resistance value of the base layer is measured.

Abstract: The present invention provides a method for recycling a spent image-forming member mounted inside an image-forming apparatus to reuse the image-forming member. In the method, the image-forming member is made of an elastomer before the image-forming member is recycled; and when a recycling work is performed, a surface of the image-forming member is not abraded, but irradiated with ultraviolet rays or ozone at least once to decompose or/and deteriorate a deposit which has attached to the surface thereof in a use thereof so that the deposit is removed from the surface thereof.

Abstract: A conductive rubber roller 10 has a conductive rubber layer 1, containing chloroprene rubber, and composes an outermost layer thereof. When an alternating current is applied to the conductive rubber roller 10 at a voltage of five and a frequency of 100 Hertz, the dielectric loss tangent is 0.1 to 1.8.

Abstract: A foamed rubber roller including a foamed elastic layer formed as an outer layer thereof. The foamed elastic layer is composed of a thermosetting elastomer composition containing 100 parts by mass of a rubber component and 5 to 60 parts by mass of zinc methacrylate or 5 to 60 parts by mass of a mixture of methacrylic acid and zinc oxide as a filler. The thermosetting elastomer composition is foamed with a chemical foaming agent or a combination of a chemical foaming agent and a chemical foaming assistant agent.

Abstract: A semiconductive rubber roller comprising a toner-transporting portion whose outermost layer is formed essentially of vulcanized rubber containing 0.1 to 30 parts by mass of a phthalocyanine compound for 100 parts by mass of the vulcanized rubber. An electric resistance value of the semiconductive rubber roller which is measured at a temperature of 23° C. and a humidity of 55% is in a range of 103 to 109?, when a voltage of 100V is applied thereto.

Abstract: A toner transport roller (10) including a sealing member (3), for preventing leak of toner, which contacts a peripheral surface of a rubber roller (1) thereof slidably. The toner transport roller (10) contains 3 to 50 parts by mass of alumina for 100 parts by mass of an ionic-conductive rubber and a loss tangent-adjusting filler. The annular sealing member (3) is slidably fitted on both ends of the rubber roller (1) in an axial direction thereof. It is preferable that the specific gravity of the ionic-conductive rubber is set to not less than 1.2.

Abstract: A developing roller composed of a rubber member including not less than two vulcanized rubber layers including a surface layer and a base layer. A hardness of the surface layer is set higher than that of the base layer. The hardness of the base layer is set to not more than 60 degrees in a JIS A hardness. A hardness of a laminate of all layers including the base layer and the surface layer is set to not more than 70 degrees in the JIS A hardness. An electric resistance value of the laminate is set to not more than 1010?, when the electric resistance value is measured by applying a voltage of 100V to the laminate at a temperature of 10° C. and a relative humidity of 20%.